I noticed that Michael Elliott mentioned he liked the Continental caps for power supplies, so there's one positive reference. What I was trying to say is that generally, for power supplies, I prefer the added capacitance that electrolytics bring to the table. That's why I mentioned Black Gate, Nichicon and Cerafine. They're all current production, fairly inexpensive and high quality. They're not your average electrolytic, and some compare them to polypropylenes.

On the other hand, for supplies that don't have large current requirements, large values of capacitance aren't required. I've worked on some tube circuits that only really needed 20uF capacitance in the power supply. That's low enough that you can use capacitors other than electrolytics.

Some of these parts are tens, even hundreds of dollars for a single capacitor. So that's something to think about. And if power supply ripple is a problem, you need big values so a ten dollar premium electrolytic might be better than a hundred dollar foil in oil or polypropylene cap. That's the point I wanted to make.

Wayne